I would say the R1 is very similar to the Sitka Kelvin Active. But compared to the 240, the R1 would be biased towards warmer conditions and/or higher activity levels. The 240 is better at blocking wind. The fit on both is lean with long sleeves. The R1 has extra long sleeves and no thumb holes. Too long for me. The 240 is a little too long, but when using the thumb holes it fits well.
