If i pair a PC3 Ram with a PC3L Ram will it still be dual channel?

Requiements for dual channel

The capacity of teh RAM modules should be the same (2GB, 4GB, 8GB etc.)

Identical DRAM technology of the module pair (128MB, 256MB, 512MB or 1GB)

The DRAM bus width should be identical (x8 or x16)

Both modules should be either only single-sided (1 rank) or only dual-sided (2 rank)

The modules don't have to support the same latency, because If one is CL 15 and the other is CL 16, and if CL16 module is placed on first RAM slot, then the CL15 module will work at CL16. There is also a chance that the system won't boot at all when the latencies are different, but it is not a requirement for dual-channel.

Identical voltages isn't also a requirement for dual channel, but the system most likely won't boot when you pair RAMs with different voltages. You also have to make sure, whether the device supports DDR3 1.5V at all.

Frequency isn't also a requirement, because it is the same situation as the CAS Latency(CL). If a RAM module is 1333MHz and is placed on the first RAM slot and a second RAM module with 1600MHz is installed, then 1600MHz will work at 1333MHz.

The mentioned things above are the general requirements and non-requirements for dual-channel, but whether dual-channel will work on different frequency and latency modules may heavily depend on the motherboard and BIOS, so I suggest you to also make sure that latency, frequency and voltage are also the same.