This question is very similar to ask, If All the Cars are the same? And Abviusly the answer is No.
Yes, there are many difrences in Sign material as well as their value. Just to make an example: A roll of Translucent 3M Vinyl cost $1500.00 But, The very same color in imported material can cost only $75.00 per roll. This price difference is not just for the branding name , 3M has proven in the last 40 years that their material last for many years witout fading or changing in color. This applies to most of the material in our industry. And obviously this price change will affect your cost as a customer as well. Please make sure to educate yourself or go to a sign company which can offer you all available materials.