I have mine at the same time but in the same arm.I chose to split mine so had both in the same arm. At least that way there's one side you can sleep on!
I prefer not to have an injection too close to my CGM and don't want to waste time with two separate appointments.
Last year, the nurse was unsure about it but decided she could get the two jabs far enough apart on one arm and I had no problems so will be doing the same next week when my jabs are scheduled.