Glad you got them done. I never replaced my 2.0 seals so I don't know if they are different. Typically they are the same. Do remember that if there is any leakage past the valve stem it is very hot exhaust pushing up on to the bottom of the seal. On the intake side it is comparatively cooler (if one can call 200 degrees cool) air being drawn down the valve stem. So the heat may affect the seal differently over time.
The exhaust seals generally do little except when the engine is not running. Then they prevent excess oil from dripping down the stem. While the same applies to the intake those seals also are effective any time the valve opens and there is a vacuum attempting to pull oil down the stem.
The back, what can I say, it comes with working on cars. My son drove his grandmother's "she doesn't drive anymore" Mazda 400 miles to visit this weekend. All the time I thought the car had a timing chain not a belt. While the car only has 40,000 miles the belt (yes, it does have one) is 23 years old!!! So, no driving that until the belt is taken care of.
Turns out his car was stored here (and also needed the timing belt changed). But, we had already purchased the parts. So, his car got the new belt - and I got a sore back. And..., grandma's old car is sitting in my yard awaiting to get its timing belt changed too. So, once my back gets better I can look forward to it not staying that way.