^ I can't say for sure. But, if you want to go the Chinese IEM way, you can pick-up IEMs for about a USD if you look for it.
You go for a different set of tips because
- Your ears do not get a good seal with any of the stock tips
- You do not like the harshness in high frequency or want to cut off a bit of the "boom" in bass
- Lost the stock tips that fit your ear :ashamed:
The tips I've mentioned are used for "modding" by people at head-fi and hence it's likely that we would get similar results with it.
The too cheap Chinese IEM tips or the duplicate "Sony replacement tips" they sell on eBay may do it, since everything these days are made at Chinese factories. But, they would lack the quality control the original products impose and well... it could infect ears too
People use one of their other IEM tips - like Ety, UE, SoundMagic, RE0 etc., to get a comfort fit. That should be the first thing people with multiple IEMs try.
Shures may appear costly @ $4 a pair. But the life they provide is pretty good. You could
"de-core" or expand them to fit your IEM. They are washable and hence have a long life.
Comply foams are over-priced for their life of 2-3 weeks. But foams could tame down certain frequencies and change sonic characteristics. Besides, people use it in combo with olives to tune the sound sometimes.
Sony Hybrids again are over-priced because they do not offer single size packs (like Small/Medium), but an assortment of sizes (SS, S, M and L) - out of which only one will fit you. But they seem to provide a good seal for some IEMs.
All the above is based only on reading head-fi and not on experience....