Yes many people swap engines in RC Cars. This can be done. This site teaches you how to replace the engine in your RC Car : http://www.rccaraction.com/
Impossible to answer with out knowing what cars and what engines.
yes they are the same engines.
4g63,4g93,4g92,6g72 and a couple more
You can only swap an engine of a Civic Hatchback with an engine of a newer car. Its only legal to swap in engines of the same or newer OBD series. So the Civic engine you swap with has to be a 94 or newer but any of those engines will fit.
If its the 2.5, you can swap it for some of the older eclipses and Chrysler sebrings. They use the same engine. (Mitsubishi)
Mazda mpv 2001
Pretty much any 4.3 V6 from 1995 to 2005. For the exact same ones, that would be 1996 to 2002 model year. As for doing an engine swap, you can swap in a number of different engines, if you have the time, money, resources, and know-how. A GM small block could be swapped in, or you could swap in a 3.9 Cummins 4BT or 3.9 Isuzu diesel (for the latter, adapters are more readily available to mate it with the 4L60E transmission in your Astro).
sr20det n14 i've been told
nissan 300xz turbo
2.2 ltr four cylinder
YES they are the same engines.
If same size, yes.