Depends what you mean by compatible. As it's the same original (note "original") model, the contact points are most probably the same, so you can fit the ETO flight dynamics to the older model. I am not sure about the xdp, because the ETO model has the modified sounds as well. There may have been changes to the gun positions - ask Clive about that one.
The textures are not identical. I can't r5emember everything that got changed, but enough things did for it not to look right.
If I were you, I'd use the ETO model instead. If it's for missions you need it, then open the mission with notepad and use the "Replace" tool.