s14 prefacelift ecu compatability with s13 chip?

[Ent1ce]

I have a pre facelift JDM S14 ecu uopn first glance you would mistake the internals as being an s13 ecu how ever its not.

http://ent1ce.deviantart.com/a...96646

its wired into the vehilce now we replaced the s13 ecu plug and rewired in the s14 prefacelift ecu plug (which is the same plug as a rb20det r32 plug)

the car runs on this ecu only runs s**t when cold due to different cold start from s13 to s14 and runs s**t in low revs as the s14 ecu will be making adjustments in timing that wont match suit the s13 non variable timing engine

i wish to know if it is possible to fit a s13 daughter board chip to convert this ecu to run a s13 black top motor as they apear to be the same layout as a s13 ecu only with the different plug layout

Any thoughts ideas?
Modified by Ent1ce at 8:12 PM 3/7/2009