Is it okay to skip some updates, then update about 3 or 4 updates later?
Not with the "update files only".zip file. The "update files" only contain the files that have been changed since the last udpate. Skipping updates when you use the update files will result in errors.
Either you use all update files in the correct order, or download the full new version and move the entire content of save folder from the old game folder to the new game.
On android, the .apk file is used to update the game.