I wrote to the author of the addon and he replied that yes, you can use them as a replacement for your own and even separately from soldiers
answer
Monolith Fanatic [creator] 3 hours ago
if he wants, let him take it. When I meant that operas use materials from HECU Remastered, this does not mean that they cannot be made independent from HECU Remastered. You can easily make them separate.
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