A carpenter install 10 bundles and 4 hours another carpenter install 50 windows in 20 hours are the two carpenters at the same rate

So lets see

work to time=work:time=work/time

if they are the same rate, then they will simplify to the same thing

10 to 4=10:4=10/4=5/2

50 to 20=50:20=50/20=5/2

5/2=5/2

they are same rate

Yes, when showing the work as a proportion, the unit rate, I'd the same.