DP83867CR: clock sharing between Ethernet Physical Layer Transceiver

I want to use DP83867 as 1Gb Ethernet tranceiver with an 25MHz cristall,

 on the same board DP83822 as 100Mb T Base Ethernet , need 2 seperated Connections,

can I use the Clock_Out from DP83867 to provide the Clock for the DP83822 or better use dedicated cristall for each of them?

any hints or expierience? 

Many thanks, Kind rgds, Thomas