Adding an MFD?

Hello,

I have a RayMarine system on our boat, with an e95 MFD, Digital Radar, Evolution AP, ST60 instruments (with converter) etc. It's working fine, but I am considering adding an additional MFD - either an a65 or a75 so I can see what's going on when I'm below. I already have a Raynet HS-5 (ethernet) switch to tie it in.

Questions:
1. Can I use the charting already installed in my e95? (I have nice, new Navionics charts on one microSD card, plus various Lighthouse charts on my second card) and;
2. Will I need to tie in the SeatalkNG network as well?
3. Assuming the answer to 1. above is "yes", can I use different charts in the two different MFDs?
4. Are there any issues with delays/waiting for charts (or radar display) to load?

Thanks!

Hartley