R. Yochanan says that if a Nazir separates Ma'os Stumim for his Korbanos and then he dies it is a Halachah l'Moshe mi'Sinai that the money is used for Olos Nedavah. (1)
The offspring and Temurah of a Shelamim and Olah are brought on the Mizbe'ach.
The offspring and Temurah of a Chatas are put to death.
Any Korban that the Din is regarding a Chatas that it is put to death if it is an Asham it is sent to pasture until it gets a Mum. (2)
If the Asham is brought on the Mizbe'ach instead of being sent to pasture it is an Isur Aseh.
An Asham that was sent to pasture and was brought as an Olah before it had a Mum is a Kosher Korban. (3)
A BIT MORE
1. Reish Lakish says that it is learned out from a Pasuk.
2. It is a Halachah l'Moshe mi'Sinai that the Asham it is sent to pasture until it gets a Mum and then it is redeemed and the money used for an Olah.
3. However if it is brought as an Olah before it was sent to pasture it is not Kosher.
The Gemara asks why are Ma'os Stumim used for Olos Nedavah if the money of a Chatas is mixed in with them. Tosfos asks why does the Gemara not answer that even though money of Chatas is mixed in if he chooses to he can use all of the money for an Olah. Tosfos answers that in this case he said that this money shall be for the Korbanos of my Nezirus. Since he said the money is for my Korbanos he cannot use all of the money for only one Korban. However if he says that this money shall be used for my Nezirus without mentioning Korbanos he may use all of the money for one Korban.
What is the Din of the offspring of Kodshim? The offspring of a Shelamim and a Temuras Shelamim is brought as a Shelamim. The offspring of a Todah or the Temurah of a Todah is brought as a Todah, but no bread is required because bread is only required with the Todah itself. Only the offspring is brought as a Korban, but not the offspring of the offspring, because it is apparent that the person is delaying bringing his Kodshim in order to raise flocks of animals and therefore the Rabanan penalize him and the offspring of the offspring may not be brought. (Rambam Hilchos Temurah 4:1)