no

The answer is no. For PON ONT there's a GPON board to interconnect

NO ... 10G PON board not work with PON ONU.....

We can use same splitters, cables and ODF, but we can not use same OLT, same ONU for 10G PON and PON OLTs.
Your questions's answer is NO. 10G PON doesn't support PON ONU.

10G PON
- Downstream : 10Gb/s @ 1577 nm
- Upstream : 2,5Gb/s @1270 nm
GPON
- Downstream : 2,5Gb/s @1490 nm
- Upstream : 1,25Gb/s @1310 nm

The specifications and the standards compliance of 10G GPON is:

Operating Wavelength: Tx: 1577 nm
Rx: 1270 nm
and that of PON ONU is : Tx: 1310 nm
Rx: 1490 nm
Therefore 10G PON board cannot work with PON ONU.

No, the 10GPON board cannot work with GPON ONU.

It can't support but it can be use/utilze through connecting AWG port & aTunable laser with Colorless optical source technology is used to resolve this issue

No, 10GPON board can not work with the PON ONU, the ONU should be upgraded to a 10GPON ONU, but the ODN network can be re-used without any problem

of course no, impossible

No, 10GPON and PON working on different wavelength, so 10GPON board can not work on PON ONUBut in ODN and passive part like splitter they can use.