You need to look into json file and find this similar structure for each card:
"CustomDeck": {
"1": {
"FaceURL": "http://cloud-3.steamusercontent.com/ugc/914661348662003079/38ED10B48430E9C46BAB9C8908FCBD8C931A9CE3/",
"BackURL": "http://cloud-3.steamusercontent.com/ugc/914661348662003299/AE2D7A34A0C6FE201341DBF9D390657108D3DA35/",
"NumWidth": 10,
"NumHeight": 7,
"BackIsHidden": false,
"UniqueBack": false
}
Coordinates of front and back 'tiles' always match.