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There are two factors, the tooth capacity and the maximum sprocket capacity. A long-cage derailleur might be rated to take up 37 teeth's worth of chain but may not stretch far enough to clear a 40t sprocket without fouling it.
If you put too big a sprocket in and are not careful, you can kill your derailleur. I would say get the cassette and try shifting all the way up to 40t. If the derailleur clears the sprocket (b-screw adjustment needed) you're good to go; if not just get the road link.
frankenbike
@TheArchitect
Yeah the gs whatever that means! Thanks for the heads up on the hanger extender. Interesting that wolftooth’s calcuations suggest that I don’t need a gs deraileaur anyway!
50-34+32-11= 37
48-48+40-11=29