Hello, i'm about to buy a practice amp and i noticed that it doesn't have a regular 3.5mm headphones input, but the same input as for the guitar cable.. i know they sell headphones with that jack as well, but i have some really good sennheiser headphones (more expensive than my guitar and that amp combined), so i wanted to know if it would work if i bought something like this!

would this even work? would the sounds be the just as good?

Thanks in advance!
Yes and yes.
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That'll work just fine, and there wont be any difference in sounds whatsoever..
And for the record...that's a "regular" sized input for headphones. Most high end headphones will come with an adapter like that.
Things with strings:
Ibanez J.Custom, Prestiges, RG8, SR5 bass etc
LP's, Strat, Tele
ENGL Retro Tube 50
5150 III 50W
Orange Terror Bass