That'll be fun! It's awesome that you can do that!
Other people have given good advice if your goal is just to play.
If your goal is to get a deeper understanding of the concertos and specifically how the piano integrates with the orchestra, you might want to get an orchestral score to study what's really happening. But you'll need to search for "full score" specifically (like this). I like to read along with orchestral scores sometimes as it's super interesting for me as an audience. On why you might want to, there's a fantastic masterclass here where Maxim Vengerov is teaching young violinists why they should pay attention to the full score and not just the piano reduction, which doesn't give them all the information they need to play the concerto really well. He says the same thing in other classes that are on YouTube but in this one there's the full RCM orchestra so it's all much clearer. I haven't seen anyone doing this for piano concertos yet, but maybe it exists and someone else will tell me where.
You can see the 2-pianos setup being used in this masterclass, where Lang Lang is playing the piano reduction and the student is playing the solo part. In this case the student is much younger and they're not getting into how the solo and the orchestra interact much, but it's still fascinating.