Shinya is the second Kyoryu Gray, descendant and the one chosen to pick up the mantle by Tessai.
Phillip is the first graphite Ranger - the first presumably chosen by the Graphite Energem.
Shinya wears a yellow sash and Kyoryu Buckle like the other Kyoryugers.
Phillip has a gold sash and gold Dino Com, unlike the other Dino Charge Rangers.
Shinya was initially introduced as a supporting cast member/civilian, who was Tessai's descendant and a mangaka/writer.
Phillip was also initially introduced as a supporting character reclaiming Zandar's treasures from Amber Beach Dinosaur Museum after discovering they had misrepresented Zandar royalty.