This topic has come up once or twice on the COTI boards. The general consensus is that both games are D20 and it should be very easy to do a conversion of things from one to the other. So easy in fact, no one has much interest in actually doing the work. The books covers so much of the same ground that it's usually just little tweaks to one or the other to make a perfect game.
I thought about re-writing T20 to use the D20 Future rules. But after looking through the SRD, I couldn't find a whole lot D20 future did better enough than T20 to want to replace the T20 rules. Perhaps I've underestimated the desire of D20 players to have their games written precisely to the latest edition of the rules.
I thought about re-writing T20 to use the D20 Future rules. But after looking through the SRD, I couldn't find a whole lot D20 future did better enough than T20 to want to replace the T20 rules. Perhaps I've underestimated the desire of D20 players to have their games written precisely to the latest edition of the rules.