Which matches do you refer to or could you clarify your question more
Most points scored in an International match was on 27th October 1994 Hong Kong 164 - 13 Singapore.
Because in union you need no skill level (0%), unlike rugby league where you acually need to be fit, also there are less trys in union and point are mainly scored by kicking
To date. English Rugby Union Footballer Jonny Wilkinson. He has scored a record 1178 test points (British lions/England).
Its the IRB (International Rugby Board)
Two points.a union try is scored at 5 points with a successful conversion being a further 2 point
2 points in union and in league