you can use trim sheets to patch. if you just want the colors to match

if you don't have an iron or heat gun.
you can use lower temperature film like tower kote.
not the best film in the world but they'll stick better. you can almost rub it on
with you fingers.

when sceheme triming...sometimes i don't need to use the iron
i use soap and water to activate the adhesive and squeegie out the liquid with a credit
card to get out the bubbles. the same as your window tint.

if you apply heat bubbles will generate when putting film over film.
remove bubbles wiht a needle...but the soap and water is a cleaner job.