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You didn't mention the obvious solution: a single connector for all the circuits. For example, a genderless array connector*.

Or, for minimal cost, an elastomeric "Zebra" strip* (only for slow, low current signals).

Or, for flexibility, consider one or more FFC (Flat Flex Cable) jumpers and FFC sockets* on each PCB.

Assuming that there is a reason why you must have 20 separate connectors, then consider board-to-board mezzanine connectors with a high degree of compliance to accommodate misalignment. For example, blind-mate board-to-board connectors* or genderless self-mate mezzanine connectors*.

Or, consider compression components: pogo pin headers* or spring leaf headers* on one board and matching targets* on the other board.

(*) My site

You didn't mention the obvious solution: a single connector for all the circuits. For example, a genderless array connector*.

Or, for flexibility, consider one or more FFC (Flat Flex Cable) jumpers and FFC sockets* on each PCB.

Assuming that there is a reason why you must have 20 separate connectors, then consider board-to-board mezzanine connectors with a high degree of compliance to accommodate misalignment. For example, blind-mate board-to-board connectors* or genderless self-mate mezzanine connectors*.

Or, consider compression components: pogo pin headers* or spring leaf headers* on one board and matching targets* on the other board.

(*) My site

You didn't mention the obvious solution: a single connector for all the circuits. For example, a genderless array connector*.

Or, for minimal cost, an elastomeric "Zebra" strip* (only for slow, low current signals).

Assuming that there is a reason why you must have 20 separate connectors, then consider board-to-board mezzanine connectors with a high degree of compliance to accommodate misalignment. For example, blind-mate board-to-board connectors* or genderless self-mate mezzanine connectors*.

Or, consider compression components: pogo pin headers* or spring leaf headers* on one board and matching targets* on the other board.

(*) My site

You didn't mention the obvious solution: a single connector for all the circuits. For example, a genderless array connector*.

Or, for minimal cost, an elastomeric "Zebra" strip* (only for slow, low current signals).

Or, for flexibility, consider one or more FFC (Flat Flex Cable) jumpers and FFC sockets* on each PCB.

Assuming that there is a reason why you must have 20 separate connectors, then consider board-to-board mezzanine connectors with a high degree of compliance to accommodate misalignment. For example, blind-mate board-to-board connectors* or genderless self-mate mezzanine connectors*.

Or, consider compression components: pogo pin headers* or spring leaf headers* on one board and matching targets* on the other board.

(*) My site

You didn't mention the obvious solution: a single connector for all the circuits. For example, a genderless array connector*. I wonder why you don't want to go that route.

Assuming that there is a reason why you must have 20 separate connectors, then consider board-to-board mezzanine connectors with a high degree of compliance to accommodate misalignment. For example, blind-mate board-to-board connectors* or genderless slef-mate mezzanine connectors*.

Or, consider compression components: pogo pin headers* or spring leaf headers* on one board and matching targets* on the other board.

(*) My site

You didn't mention the obvious solution: a single connector for all the circuits. For example, a genderless array connector*.

Or, for minimal cost, an elastomeric "Zebra" strip* (only for slow, low current signals).

Assuming that there is a reason why you must have 20 separate connectors, then consider board-to-board mezzanine connectors with a high degree of compliance to accommodate misalignment. For example, blind-mate board-to-board connectors* or genderless self-mate mezzanine connectors*.

Or, consider compression components: pogo pin headers* or spring leaf headers* on one board and matching targets* on the other board.

(*) My site