OP has a TR4 - and yes, so far as I know they were all delivered with grey loop. Since his prior posts seem to express an interest in 'original/correct' the decision may already be made.
Also for the TR4, rubber mats were originally provided for the footwell floor carpeting and not the Salt and Pepper Gray Loop carpeting. Those original style floor mats are no longer available and the modern carpet suppliers supply carpeting pieces for those two areas of the floor from the front edge of the seats the the mat clips located several inches up the firewall from the forward most part of the floor. Not sure, but I believe the TR4A came from the factory with carpet in this area.