Hey there Superpilotv2!The P-51B/C's have been undergoing a long-term updating process to bring them up to the same standard as the P-51D products. As the creator of both, I can easily say that no, they aren't on par with each other, but if you want early-model P-51's, I think they hold their own. There is a two-year difference between when the B/C's were released and when the D's were released, and during that time, the developed skill-set and available resources to recreate the P-51D airframe to the nth degree we went to, became available, and so did resources to do the same with the P-51B/C's (which, until the release of the Warbirdsim P-51D's, were already the most accurate visual model P-51 types available). Everything about the Warbirdsim P-51D products, was built new completely from scratch, carrying over nothing from the earlier released B/C's, building off of original manufacturer's drawings which we did not have at the outset of the B/C build. When the update is eventually finished (which is a ground-up deal) hopefully sometime this year, it will be free to existing owners of the B/C's for FSX (but there are other good things in the pipeline as well).