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Yes it will work just fine with the 15 round mag. The 10 round is just a modified 15 round mag for sale in restricted states

Yes this will work with the standard capacity 15 rd magazines, it'll also work with the high cap 18 and 20rd magazines as well. https://hkparts.net/shop/pc/hk-pistol-parts-c15/hk-usp-variants-c406/hk-usp-9mm-usp-9mm-tactical-c199/hk-usp-9mm-magazines-parts-c482

James, yes Sir. Most manufacturers including H&K make firearm packages that have 10rd magazines so their pistols can also be sold in states that have magazine capacity restrictions. The pistols are exactly the same but just have 10rd mags included. The pistols will also accept any standard capacity magazines just fine . Cheers and stay safe!

Yes, the 15 round magazine will fit and function just fine in this. hope this helps.