Is this the correct DVR

I have fiber uverse service with gigabit service. My current DVR is a Pace ISB8005 the I'm having problems with. I called yesterday to replace this box and I asked if the could send a ISB8110 which is newer with more disk capacity. The replacement DVR was just delivered and it is a Cisco ISB7500. Is this an even older box and is it compatable with the service I have? I don't want to install it if I'm going backwards.