Well, while the juniper looked similar, this one looks exactly like mine. That must be it!
I accidentally found that there is a 'Baby Blue' cultivar which originated from 'Boulevard' and seems to differ only in size.
It's smaller and the growth rate is about 2'' per year, compared to 6'' per year for the latter.
If that's correct, we can assume that if the small ones don't double in size within a year, it's the smaller 'Baby Blue'. If they do... they'll have to be moved
Thanks for the correction!