According to Wikipedia, BTMRR at Paris and Tokyo was built by Vekoma, Florida by California I by Arrow, Only the latest
Disneyland retracking was done by Dynamic Structures. Arrow, or Vekoma probably only did the track work. The Mountain and themeing was probably done by someone else. So they are not copying Dynamic Structures BTMRR, they are advertising the BTMRR they built.
If you want to talk about early "copying" by Disney. Cedarpoint had Arrow build Cedar Creek Mine Ride in 1969 to years before Arrow build Big Thunder Mountain for Disneyland/Walt Disney World. It doesn't have the elaborate themeing but it's the same ride system.
Knotts Berry Farm in 1969 had Arrow Dynamic (coincidentally) build Timber Mountain Log Ride
https://www.youtube.com/watch?v=2xO0ooC9Ltw A highly themed log flume 20 years before Arrow Built the ride mechanism for Splash Mountain at Disneyland. What's funny is looking at
Youtube videos, it's Knott's that's accused to copying Disney and not the other way around.