PAN Card on Trade Name

when the PAN no of proprietorship and individual is same, how they can issue it in double names?

MF guidelines are diff from the pan card issue guidelines, 

No. PAN card can never be issued on the basis of trade name for sole proprietor.

PAN can only be issed to 'Assessee' as defined in Income Tax Act, 1961 i.e. Individual, HUF, Firm, LLP, Company, AOP/BOI, artificial judicial person.

No doubt sometime name of firm/sole prop. and name of individual is same like Mr. XYZ opened a firm as XYZ. In such a situation also PAN card is issued to Mr. XYZ and not to firm XYZ.

Yes, I also agree that PAN card cannot be issued on the basis of trade name for Sole Proprietor. You can check the status of PAN by confirming the Fourth letter of the PAN. P - Person, F- Firm, T- Trust, C-Company, A-AOP.