How do I use 2 DIFFERENT brands of Test Cyp?

[Remington]

I'm planning my cycle of Tren Ace and Test Cyp.
I currently get Watson Test Cyp for TRT from Walgreen's Pharmacy.{200mg/ml}
However, it's not enough so I'm going to order from a UGL. {250mg/ml}
Obviously it wont be the same quality as the one I get from the pharmacy.
The Tren will be between 200mg-250mg per week {intentional low dose}.
The Test will be 400-500mg per week
How do I incorporate the UGL Test with the pharmacy Test?
Should I use up the pharmacy Test first--or do 1 UGL and 1 pharmacy Test?
I plan on injecting the Test twice weekly.
Suggestions?
Also---feel free to critique this whole cycle...pros/cons.

Thanks!!

[Metalject]

You could use both at the same time. Just inject 100mg of each each injection.