I agree with @Tetsujin’s assessment, that going from upright to electric is a fairly easy transition. They are both tuned the same and the basic principles of how both hands are used apply. Electric bass is physically less demanding than upright and does not require the attention to detail required for good intonation, unless you decide to play a fretless bass. I can pretty much guarantee that the first time you pick up an electric (if you haven’t done so already) you will be able to play things you can play on upright without much thought and effort. I would like to add a few more detailed comparisons that might be helpful to you.
The first thing is scale length. Upright basses are in the 42-44” range. Electric basses are usually 34” for standard and 30” for short scale basses. A standard scale length would probably be more comfortable to you.
The physical position is different by almost 90 degrees. I suggest using a strap because it is important to have the neck be higher then the body for more comfortable left and right hand positions and the strap will allow you to easily keep the bass at a good angle.
Setup is very important. I’m sure you know how easy or hard an upright can be to play depending on the string height, string type, string gauge and how well the fingerboard has been dressed. A poorly set up electric can also be difficult to play. Make sure your instrument is set up well. That involves a properly cut nut, string height, neck relief (with the truss rod) and a string type and gauge that works for you. Fortunately most of these things can be adjusted easily once you learn how but starting with a professional setup is not a bad idea. Regarding strings, flat wound strings will sound warmer and feel more like upright strings than round wounds but are more expensive and usually feel a little stiffer.
Another thing is left hand fingering. You can use the upright’s 1-2-4 method of fingering on electric bass, especially in the lower register but once you get to the upper frets you may want to start training the 3rd finger to work independently and use all 4 fingers. Some players use 4 fingers all across the neck. That is a personal choice.