different project with same dll depolyment issue

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ASP.NET

.NET

deployment

I have two solution file max both solution are same but using different projects but it refers same dll . for example i have two projects
1.Project A
2.Project B

For Project A i have one solution which its refered one dll its called printer.dll

For Project B also the same

But while i deploying for this project i got two different .exe file but once i installed project A .exe file means it doesn't allow install the second one showing error like " unable to install beacause a newer version of this product is already installed"

But after uninstall the project A setup means i can able to install the second exe but again i try to install the Project A setup means showing same error like "unable to install beacause a newer version of this product is already installed"

But i want to install both of this setup in my machine please help me ..