Sounds like it! A lot of commercial companies limit FOs. The RAF doesn't however. The x-wind limit for the VC10 is 28 knots dry / 20 knots wet regardless of who is flying it. My first commercial company limited FOs to 20 knots, my present 15 knots. However, at the discretion of a training captain it can be the aircraft limit and hats off to the training captain who let me land at the aircraft limit on my base training!
The 747-400 has a limit of 36 knots dry / 32 knots wet. The Boeing training manual reports these as being recommended as 'a result of in service reports and engineering data'. Whereas the 747-300 has a max 'demonstrated' limit of 30 knots dry / 25 knots wet. My operator has made these company limits.
As you can see, the limits are set or reported on different criteria - and I suspect the flight manuals are written with as much consultation to the company's lawyers as their test pilots! It is down to the operator as to which limit he wants to use.
Incidently, a swept wing jet tends to have lower crosswind limits than you would expect - compare the Bulldog's limit of 35 knots in RAF service with the 28 knots of a VC10. This is because when you induce yaw on a swept wing, it's lift increases proprtionally more than a straight wing. A lot of aileron has to be input to keep the wings level when kicking off the drift. The VC10 limit is 28 knots, because at 28 knots crosswind you have applied full aileron to counter the secondary roll.