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There wew differences in the compressors used on '88 model Reattas and the the compressors used on the '89-'91 models.

The connectors used on the '88 models had a blade style male connector and the later models used a female style pin connector. There may be other differences in the compressors as well but for identification purposes this will be one major difference.
compressor_connectors.jpg
Thanks to Padgett for the photo
Thanks to Padgett, member of the AACA Reatta forum, for this information.