Colors can also vary with monitors too. A HD display made for gamers may have a higher contrast and brightness than a monitor for general use. Most cheap flat screens are like this. The old CRT monitors actually displayed better color than many flat screens. I actually bought a flat screen made specificaly to reproduce acurate color. I think it was a vivox. The easiest thing to do is to callibrate both monitors. Your mac or pc may have a program under your gamma settings to help with this and I think there's even a simple online calibartion technique or you can buy software and or a device to help calibrate. I think there's a thing called a color spider but these can be fairly expensive.
Yeah, make sure to calibrate them and also make sure that the software is using the appropriate profile. And really all your gear should be calibrated to use the same profile. Camera, printer, scanner as well as the monitor. But, obviously, the monitor is where you're seeing the problem.
Also, make sure that the lighting you're using is the same in both cases and that you have no natural light coming in to screw things up.