POS OC48 interfaces using different wave length

Hello all, I am thinking about using different POS interfaces on dark-fibers. On one side, i already have POS-OC48-LR card (Cisco). This card use 1550 nm wave length. We would like to use a POS-OC48-SR (Cisco). This card use 1310 nm wave length. Are 1310 and 1550 optics comptatible ? If yes, i guess that there is impact on the power Budget available. How-Much ?! Some colleagues reported successful implementation with such config (Cisco POS OC48 Cards) It looks strange to me and i wonder if Juniper and Cisco POS OC48 would also work corretly in such environnement ... I guess that "official" answer from manufacturer would be : NO WAY :-) Some carriers may already tested such config ? Any feedback ? Thanks. V