ABSOLUTELY, however the SAME film can be found under several different names, distributed by several different companies, with many different prices asked. The prudent, cost-sensitive photographer can save 1/2 to 3/4 the cost of each roll by purchasing "off brand" film by "knowing" the source of what he is getting.
For instance, Agfa APX-100, while discontinued (due to shut-down of factory) is still widely available in 35mm, and also private label. Sometimes the private label is cheaper. same film. Why not save?
If you could save over $4.00 a roll for Fuji Slide film, by purchasing it rebranded by a distributor, wouldn't you? Same film, different name on
package.
In both examples we are talking about major top line product, just labeled differently. Now, in addition to the above examples, there are many situations where inferior product is purchased in bulk, spooled, packaged and sold as some "esoteric" emulsion. The knowledge of origin can be helpful in this case also, don't you think? Types of film that come to mind are various microfilm stocks, traffic & survellience film stocks, Cine film stocks, etc. Films that originally were quite low in price when purchased in bulk. Knowing the "source" for a particular film stock can help in finding the lowest price.