Special cardstock vs. specialty cardstock

[Orla]

English Language Tests, Intermediate level

ESL/EFL Test #229 "Homophone test (12)", question 1

In order to make the training manuals stand out, the company used specialty cardstock rather than ......... paper for the front and back covers.

(a) pane
(b) pain
(c) plain
(d) plane

English Language Tests, Intermediate level

ESL/EFL Test #229 "Homophone test (12)", answer 1

In order to make the training manuals stand out, the company used specialty cardstock rather than plain paper for the front and back covers.

Correct answer: (c) plain
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Hello. Please tell me the difference between special cardstock and specialty cardstock. Thank you very much. Orla

Orla

[Mister Micawber]

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The concept seems the same for both to me.
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Native English teacher at Mister Micawber's