srx1500 HA Control Port

Hello,

due to SRX650 end of sale, we had to lately order 2 SRX1500;

those SRX1500 have a new dedicated HA Control port which is SFP based so, apparently 1G speed (Copper of Fiber)

so, SRX-SFP-1GE-SX or SRX-SFP-1GE-T GBIC should be OK for this HA Control port

Question :

without such a GBIC, might we use an EX-SFP-10GE-SR GBIC instead , for this HA Control port ?

(EX-SFP-10GE-SR is compatible with SRX-SFP-10GE-SR as shown here :

http://www.juniper.net/techpubs/en_US/release-independent/junos/information-products/topic-collectio... )

but we don't know if it would work for a 1G port ...

thanks for your help