It is acceptable to attach patch cords to fibre optic cables that have the same core diameter, i.e. 62.5/125 (OM1) patch cords can be used with 62.5/125 (OM1) cable and 50/125 (OM2/OM3/OM4) patch cords can be used with 50/125 (OM2/OM3/OM4) cable. Products with different core diameters should never be connected together. It should also be remembered that, in the same way as with copper cabling, when connecting two products with different performance levels the best performance that can be expected will be that of the lower performing component. So, if an OM2 patch cord is connected to OM3 cable, the best performance that can be expected is that of OM2. Equally, if an OM3 patch cord is connected to OM2 cable then the performance will still only be that of OM2.
As such, there will be no problem in using an alternative product that has a higher performance than that required but a lower performing product should never be substituted for a higher performing one. As a general rule of thumb, all of the components used within a fibre channel should have the same specification in order to maximise performance and data transmission.