Different Solar Panels Together

I am no expert on this subject, but as long as the voltages are not significantly mismatched and diodes are used appropriately, using different panels together shouldn't be a problem.

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If batteries are used in conjunction or if the electricity is being inverted to AC, alternatives exist of maintaining separate controllers and battery systems or separate inverters.

Well yes and no....

https://www.altestore.com/blog/2012/08/adding-capacity-to-your-existing-pv-system/

I could almost agree with this answer, but it depends . . .

Seriously, more info is needed on the desired configuration, voltage and power needs. The panels can be strung in a variety of combinations.

You list a decent site that offers a fair explanation of the considerations needed, so I gave a GA.

If you mix module types in an array, and especially a string of modules, you will diminish the performance of the better modules.

Use a separate charge controller for your new modules.

With a little research you will find a nice new 30 A charge controller called the KID that has many of the features larger 60 and 80 A controllers have. The feature, that would be most useful to you, is that two can run parallel. With two of these you could add up to 3kW of new modules of your choosing.

Both arrays would operate at maximum power points. MPPT controllers can yield up to 30% more power than PWM controllers. Maximum power-point tracking is basically a rapid scan of the amps-volts curve of a module, looking for that sweet spot that will yield maximum power. This point changes inversely with temperature, as temperature rises voltage drops, cold=high voltage, the amount of insolation varies amperage.

I would want to get the most out of what I've got (and what I'm getting), so I would keep the arrays separate on parallel charge controllers.