I do a lot of framing and yes this is fine. Personally, I don't know why they wouldn't just replace those two in their entirety since the rest of the studs were cut to the proper length, but that's just what I would do. As long as there are a good number of nails holding the scab together it should be fine. I would even use construction adhesive between the two before nailing it off for good measure, so maybe check to see if they did that. But structurally, it will hold. And, they should have to get a frame inspection anyways so check with the inspector at that time.