Is there a way to replace long hand inserter with stack inserter of the same configuration automatically without having to configure each one seperatly?

Replace?
Placing one inserter on top of another replaces it using fast replace, and keeps custom hand positions.

In the base game, long-handed-inserter does have it's own fast replace category and can't be fast replaced.
but using boblogistics, you can have the inserter overhaul, where long-handed is just a configured normal inserter, so red is just tier 2 inserters.

This mod was intentionally kept to just the adjustable stuff, to make it more acceptable for people just looking for a vanilla+ experience.

damn so if I wanted to switch out all long handed inserters, I would have to remove them and then reconfigue each one manually.

If you're not using bob logistics, and don't want to install it... Yeah, you'd have to remove and re-place all the long handed inserters with other ones.

it would actually be a fairly easy edit for any modded to change long-handed-inserter's fast-replace line to be "inserter". I do not know of a mod that does just that one thing off the top of my head.

Maybe I should have an option in the settings to turn that on?

That would be amazing