(Mostly) to kabouter & jonkka
Because of those priceless sites they run, and in order to make them more accurate.
Considering 1988 starts of Jorge Recalde & Giovanni Del Zoppo.
I've just found a few contemporary magazines (yes, the Autosprints) which revealed to me that these two were running all the events (Recalde:Portugal, Corse, Acropolis, Olympus, 1000 Lakes, San Remo & R.A.C.; Del Zoppo:Monte Carlo, Portugal, Corse, Acropolis, Olympus, 1000 Lakes & San Remo) in the Lancias run by Top Run, the Italian team. The main sponsor for the team was Campari, while drivers had their own additional personal sponsorship deals.
Also, a 3rd Lancia was run by Top Run at the 1000 Lakes, for Massimo Ercolani, although I couldn't find anything about the rest of his 1988 starts.
Finally, all the cars were Lancia Delta Integrales (Gr. N, of course), except for the Del Zoppo's car at Monte Carlo, which was a Lancia Delta HF 4WD.
I've seen pics of both Del Zoppo's and Recalde's cars from Portugal, and they're definitely both Integrales.
Hope this helps.