no because first of all you will be doing Address reuse which is something you should try to avoid.
As far as I'm aware, all the various forks of Electrum utilise the appropriate derivation paths for their specific coin... so aside from the fact that most coins (BCH excepted) use and generate completely different address formats... the actual underlying hex values generated will be completely different, even if you were to use an identical seed/custom extension.
The only time that wouldn't happen, is for an exceptional cash like BCH, where they were (originally) trying to be "bitcoin" and created identical addresses (and a boatload of confusion )
if they really use a different derivation path (like what i said in my above comment) then you are correct it won't be address reuse. but if they use the same path then even if your addresses are different (like 1... for bitcoin, L.... for litecoin, D.... for dogecoin) the keys are the same and when you create a signature, append your public key to the transaction ,... you are reusing the same key.
not that "address reuse" is not exactly reusing "address" it is reusing "key".