After listening to the snippet you posted, I've gotta say that the difference in the two sound qualities isn't really that big of an issue. If the mix of this instrumental gets finished, you'll still have a nice-sounding product at the end.
However, if it's still that much of an issue for you, here's an idea:
Whatever vinyl you got your breaks from, find an area in the track that has nothing going on, just the noise of the vinyl. The longer the segment of nothing, the better. It can prove difficult for the inexperienced to take a very short segment of nothing and edit it so that it lasts for an extended length of time; you'll be able to hear where the sample loops.
The idea is to loop a short sample of the "nothing" of the vinyl, and use it as a filter for your VST instruments, so that the VST sounds like it originated from the same source as the drums. It's time consuming, but detail is what must be stressed when one is working in sound production.
Peace