Did 劵 and 券 become variants in PRC/simplified in 1995?
No. It became a variant way earlier than that. There may well have been a document to that effect in 1995, but it would not have been anything new.

It is well established that 劵 and 券 were two different seal scripts characters, as @HenryHO points out. However, according to Qing Dynasty linguist Tuan Yu-tsai's annotated version of Shuo-wen Chieh-Tzu:


  【清·段玉裁·說文解字注】鄭云：『劵今倦字也。』據此則 漢時已倦行劵廢 矣。今皆作倦，蓋由與契券從刀相似而避之也。


So 劵 was the initial clerical script adoption of the original seal script character. According to Tuan, the visual similarity to 券 caused the character to be rewritten as 倦 as early as by the Han Dynasty.

It seems then the original 劵 character was then subsumed into the character 券 as a variant clerical script form, either intentionally or by mistake due to their visual similarity. This is supported by the Song Dynasty dictionary Collected Rimes, edited by Ding Du:


  【宋·集韻·去聲·願韻】契也。劵別書之 書以刀判契其旁，故曰契劵。 


Which explicitly named them as variants in an official government dictionary, almost 980 years ago.

Therefore, 劵 has been a variant of 券 for over a thousand years.



Addendum:

A possible earlier reference might be in the Southern Liang Dynasty dictionary Jade Chapters (玉篇) (Note: NOT the Song Dynasty 大廣益會玉篇) by the scholar Ku Yeh-wang.


  【梁·顧野王·玉篇】契書。


This has been cited by the Taiwanese Ministry of Education as the first attested use of 劵 as a variant for 券. If true, the use of them as variants would have been as early as a couple of centuries after the Han Dynasty.