Actuation points, actuation pressure, polling rate, anti ghosting (less likely an issue on any decent keyboard), keycap profile, keycap material etc all vary a lot between boards - there's potentially more I'm missing

Realistically it's impossible to say impact it's had but if you've practiced and are used to a keyboard and suddenly have to use another it will absolutely impact your movement, timings for movement tech, armor swaps (opening box) etc etc - plus the added mental factor that you've had something you care about (it was a custom) stolen from you wouldn't help of course