Hi,
Yes ren 25 turbo engine is the mainly the same, but they are rarer than the GTA these days. We seem to be getting to a point where some parts are hard to get...blocks especially as corrosion an be a problem where the liners meet it. Repairs are possible but not cheap.
There are a few other difficult or expensive items, water pumps, drive shafts, Valve springs aren't available for the turbo either (new anyway).
Overall though it's not a bad situation, you just need to tap into the network to find what you need.
Lee (mettersl)