range rover or rank rover sport

hello, I live in portugal and can only see a RR in lisboa, about 600km away. now to my question, I am putting up for RR or RRsport, I am 188 large 103KG heavy, does the headroom at both? are the seats both the same size? the rank rover costs about 61000€ basic equipment is sufficient? Leather is too warm here anyway, sliding roof is also not necessary, you may win a few cm. I have heard of a motor tuning, should be from 177hp to 2 24hp can be increased without motor risk, the sport seems to be enough in its performance. are both cars in the equipment quality the same? would I be pleased about information. greeting mercedesgrey ( had 14 years of a G)