I've used the Dutch version of the 98SE SP and it worked pretty well afaicr, it's been years since I last used 98SE.
I once installed the ME SP on a Dutch ME and even though it worked, it turned my carefully tweaked ME into a half-Dutch half-English frankenOS!
I can recommend you try the ME SP, once you start it, you can select exactly what you want to install, or if you want to install nothing.
It's not like the official SP's that, once clicked, starts doing allkinds of stuff to your rig without user interface (except when you need to download net framework blah blah 😜).
I never tried the 95 SP though, dunno if I have an English 95 laying around.