Modern special forces at Trafalgar

What if modern Spetsnaz joined Franco-Spanish ships at Trafalgar while British special forces with 1982 weapons served on Victory?

They likely turn on their nominal hosts amid confusion, while British special forces on Victory would be best employed suppressing enemy sharpshooters.

British special forces with their 1982 weapons are assigned to Victory to shoot enemy marksmen in the rigging. That task offers a direct way to protect the ship's officers. Russian troops placed on Franco-Spanish ships raise a different problem: the answer invokes Russia's wartime alignment and predicts that they could turn on the crews around them. Their arrival also creates confusion over language and allegiance. A participant questions how modern body armor would fare against cannon fire and splinters, leaving the technological advantage short of invulnerability.