Start here:
The CTSC - ZF Parts

look up both cars, see if the same ATF is spec'd

Or here: http://www.thectsc.com/products/zf-l...er-184-58.html is it lifeguard 6 for both?

Or wiki both cars and find the ZF wiki for each trans.

Edit: These guys have the best price on ATF Ive seen..under $20 per liter