hey there, you're obviously new here (noting wrong with that of course), and i hope you like the site.
The ONLY games you will see conversions of are expensive titles on the AEs that are cheap on the MVS. The big 3 are Pulstar, Metal slug 1 and Blazing Star.
KOF2001 is a current title (go to Neostore.com) and there is no reason to make a convesion. Even games like Last Blade 2 or Art of Fighting 3 sre not converted as it's not profitable to do so and the games are easy enough to simply buy. So you're safe.
I have 2 copies of 2001 (JP and US) and the stickers on mine are fine, BUt that means little. I HAD a MS4 and the sticker had the same bubble you speak of at the top. The reason is that the games are usually produced 500 ata time and ar stickered by hand so you will get a good deal of variation.
You CAN get perfect games, butyou will have to do a lot of buying and selling. But your concern was if it was legit or not and in this case you are 100% fine.