Impedance Mismatch of LVDS Differential Pairs
There's a neat little return loss and mismatch calculator that I like to use for these situations. 100R into 90R gives a reflection loss coefficient of 0.0526, meaning you're reflecting 5.26% of your signal back.

If your receiver can reject that level of noise, and you can deal with potentially 11% higher peak voltages in your waveform (due to standing waves), you should be ok.