Apologies if you already know this, but MTR 900 was a common sight on the show scene back in the late 1980's and 1990's. The car was featured in Volksworld, and was reputedly in original condition having had a very sheltered life. From memory, the original owner never drove it in the rain, preferring to use a bike to travel. I think the wings were repainted at some point, but apart from that the car was pretty much untouched.
After several years on the circuit, it disappeared, but has been seen again in the last few years, perhaps during your ownership?
I'm sorry but I don't know anything about your other Beetle.
Why don't you post up some pictures of both cars, I'm sure everyone here would be delighted to see them.
Gavin.