It's the same type of flashlight. Hard to say when something is a clone if the specifications are similar.
They share the same basic features: white light, UV and green laser (both class 3A/3R). Rotary control to select the channel, electronic switch in the middle. In addition the E26 has a tail switch for direct access to turbo. The rotary switch also has a lockout setting.
The Arkfeld Pro has magnetic charging, the E26 comes with a USB-C port. The Luminus SFT-40 in the E26 has a pretty neutral tint and is thus much better than the Arkfeld Pro with its greenish light. Output should be similar.
I like the form factor of these lights, but I worry about the built-in batteries. I don't like the idea that once the battery is done, the light is also.
I notice that the back does come off the arkfeld, but I don't know if you can source a replacement cell...