It helps to know which cpu exactly, there is no i5-5010u. There's an i5-5200u and an i3-5010u, so the 5010u is either a typo and really an i3 or a typo and really an i5 with a different model number.
Both of those are dual core cpu's with hyper threading, even the i5. The i3 is generally slower in clock speed and it's also limited to a fixed clock speed. The i5 while not overly fast in terms of clock speed vs desktop varieties it's still faster than the i3 and offers turbo boost for potentially more clock speed that the i3 doesn't offer. Both are "U" variations which are ultra low power which is why the i5 is a 2c/4t rather than a true quad core. Mobile i5's with 4 actual cores end in a "Q" suffix.
Having 4 threads, either will probably technically load the games in question. As for running them well enough to be enjoyable or playable, maybe not. Faster desktop i3's struggle a bit vs a desktop i5 in games like witcher 3 when it comes to min fps. Expect lower drops in fps with weaker/slower cpu's.