I have a feeling the remote starter is not factory and it was just a coincidence that you saw the exact model on another car. Regardless, as long as you get a remote for the Remote starter (Exact model specific) and the Keyless Entry for 3rd Gen you can program both Remotes to the system you have installed no problem.
Look on ebay for the remotes. If you can't find one on ebay, your Toyota dealer can get you one but it will be expensive
Edit:
Keyless Entry on ebay:
http://cgi.ebay.com/ebaymotors/1993-...Q5fAccessories
Toyota Keyless entry programming
1994 camry keyless entry remote programming instructions
Astostart/Astroflex on ebay:
http://cgi.ebay.com/ebaymotors/ASTRO...Q5fAccessories
Astrostart Programming:
If it has a hood pin, open hood , turn on ign step on brake, cycle ign 3 - 4 times lights will flash press start button on EACH remote to be programed. Or dip switch 8 up press brake and hold start button on each remote to be programed [old and new] erases all codes in memory... lights will flash with each remote being accepted...
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