I'm an Electronic Engineer.
One of the best tools when troubleshooting any issue, is substitution.
Being able to replace a suspect item with a known good one can save hours.

If you work on your own bikes, imagine how useful it might be to have a complete set of spare parts.
You can even take the suspect item and install it on the good bike, just to see if the issue follows the part.

I'd opt to keep the bikes the same.

All the best

Barry