I'm looking at booking some flights for a friend:

JAL3048 arrives NRT 1850 from Sapporo Chitose
SQ11 departs NRT 2050 for Singapore

Is this adequate time for the connection? I've had a look around and I found a reference to the MCT being 1h50.

I've also determined they're in separate terminals and are on different alliances so not sure that baggage could be checked right through?

Thanks