It's impossible to say, since the Joule designation of studio strobes shows how much energy can be put into the flash head. Then how much of that which actually reflects from the subject back to the camera depends on the reflector, angle, diffusers etc.
The guide number of a 600 EX-RT implies that the unit's own reflector is used, without any modifiers, and that the flash is mounted in the camera's hot shoe.
This can only be specified at a certain setup, and then you can just test it with a single flash unit replacing each studio strobe. Take a picture and see how it's exposed, comparatively. If you need to open up the aperture three stops, you can see that you need a guide number eight times as high.
Say you take a picture with strobes, and you get a good exposure at f/8. Your subject is 3.75 m from the light, so the light is equivalent to a guide number of 30.
Now you put one flash there, and find you need to open up to f/4 to get the right exposure. So the guide number of that flash must be 15. Since combined guide numbers are computed as the square root of the sum of the squares of the guide numbers of the individual flashes, you need four such flashes to come back to f/8 for the exposure.