Hmm, the guide doesn't mention using a 2.0l ecu and no mention of the injectors either. I don't know if 1.8 XR2i and RS1800 injectors are the same, manufacturers generally fit the smallest injectors they can (to get the best atomisation) so they could be different. I do know that the following injectors are the same;
DEWY, EARS, DESK, DEEP (all 2.0l ecus) and BLOB and SACK (1.8l ecu's)