Hi there and
to the forums!
What adorable little budgies you have
I agree with Aluz regarding their mutation
From the latest picture, it does seem that the budgie on the left is a mauve recessive pied budgie, although he is very grey.
Are his bluish cheek patches more violet or silver?
I hope to see more of both your boys soon, and you as well!
You couldn't have come to a better place to learn even more about budgies--be sure to read through the forums, beginning with the "Budgie Articles" and the "stickies", or threads "stuck" to the top of each subforum for easy reference, to ensure you're up to date on the very best of budgie care
If you have any questions afterwards, don't hesitate to ask as we'd love to help