Apple has installed with support for external rats and track tracks on iPadOS 13 as a feature in accessibility settings for users who have trouble using the tablet's touchscreen and therefore control and monitor their program. In iPadOS 13.4 they have improved the feature to make it more accurate and useful in text selection.
Apple has made it clear that this is a tool for everyone with the introduction of a magic keyboard with an integrated third- and fourth-generation Pro Pro trackpad. And it's not only compatible with product limits, but also compatible with third-party restrictions. However, the first versions of Magic Mouse and Magic Trackpad do not work as well as expected.
Compatible, but partly
All owners of the first versions of Magic Mouse and Magic Trackpad who want to use it on an iPad with iPadOS 13.4 will be able to do that, but there will be limitations such as: Investigation doesn't work. The user will not be able to slide up or down by sliding one or two fingers on the touchpad of these types.
Finding out if you have first or second generation is really easy. The main difference between the two is that the first uses the batteries, and the second features the rechargeable batteries with lightning connections. The physical appearance among the generations of Magic Mouse is no different, but in the case of the Mark Trackpad they have a different design.