Historical clue formulations

• Tofurky, to turkey, e.g. — 2014-12-14
• Basis of comparison — 2014-05-24
• One that's similar — 2004-11-07
• Equivalent — 2000-03-26
• Similar version — 2000-01-15
• Veggieburger, to a hamburger, e.g. — 1999-08-29
• Similar item — 1995-02-20