Unfortunately this is typical. When you record with multiple digital devices one must be able to send out a clock source. It can be from a variety of places, which makes it all the more confusing, but it can be Word Clock, through spdif or AES, or ADAT light pipe, depending on what the unit provides. Then the other units have to have the function of being able to change their clock from internal to receiving that clock in order to be locked. Otherwise drift is inevitable, even with two of the same model recorder.
The bummer with inexpensive two channel interfaces and devices is that they won't have this function, and bumping up to the one that does generally gives you two or more line inputs so you don't need to use the clocking anyway : ( Actually, FocusRite does have the Clarett2Pre, which is 2 preamps and ADAT in, but at $500 it makes having four tracks a $700 proposition and there are better ways to do that.
Yeah, sadly they either need to have their digital clocking locked or else take the analog out of the Zoom into line ins of the Focusrite, if it had two more inputs.
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