Pricing would just be another way to describe valuation. I guess if you want to get technical, pricing - is the act of getting somethings valuation. While valuation - is the estimate of somethings worth.
Security analysis -
An examination and evaluation of the various factors affecting the value of a security.
Side Note: While pricing is valuation, price is not. Price is how much the stock, or security costs most commonly determined by a market.
Add On: The meaning of two words might matter depending on what context it is being used in. For example if we were talking about a market where an individual actually sets a price at random without doing any type of evaluation then this->answer that AlexR provides would better highlight the differences.