License by endorsement

I currently have my nursing license in MA by exam. I am now in the process of doing my CA license by endorsement and have mailed out the paper work today. My question is if I can start to fill out another application for the Colorado license by endorsement, before my CA one has even been processed? Can you fill out and send multiple endorsement applications at the same time or do you have to do it one at a time?
My original license is in CT, I'm endorsed in Mass and Georgia. I did those both simultaneously, although Mass took about 4 days to process and Georgia took about 4 weeks, both of which I was told were normal.