They're both Red cards in this game, but in the original, Japan-only Digital Card Battle, RealMetalGreymon was a Yellow card
Trading card display cases are commonly used in sports card shops, hobby stores, collectible retailers, gaming stores, and specialty retail environments that sell high-value or collectible merchandise
So, in total, the top border up to the art box is 8mm, the sides are 7mm, while the bottom up to the text box is 9.5mm

This deck contains the following cards:Extra Deck (x15):Decode Talker Extended (x1) - Ultra RareAccesscode Decoder (x1) - Super RareTalkback Lancer (x1) - Super RareExcode Talker (x1) - RareShootingcode Talker (x2) - RareEncode Talker (x2) - RareCode Talker (x2) - RareCode Talker Inverted (x3) - CommonDecode Talker (x2) - CommonMonster (x24):Code Radiator (x1) - Ultra RareCode Exporter (x2) - Ultra RareProxy Horse (x2) - Ultra RareDefcon Bird (x2) - Super RareSwap Cleric (x2) - Super RareProhibit Snake (x2) - Super RareLatency (x2) - Super RareMicro Coder (x3) - RareCode Generator (x2) - RareBoot Staggered (x2) - CommonBalancer Lord (x2) - CommonDotscaper (x2) - CommonSpell (x6):Cynet Optimization (x2) - Super RareCynet Backdoor (x2) - RareCynet Crosswipe (x2) - CommonTrap (x10):Cynet Conflict (x2) - Super RareCode Hack (x2) - RareCynet Cascade (x2) - CommonRecoded Alive (x2) - CommonLimit Code (x1) - Common This deck contains the following cards: Extra Deck (x15): Monster (x24): Spell (x6): Trap (x10):

While the deck normally uses Harmonizing Magician to summon a single Omega followed by a rank 4 Xyz play, White Wings status as an extra tuner can allow for 2 Omegas to be summoned
And the rarest of the rarest are the original Japanese-language versions of the cards offered to members of the Pokmon Players Club, who could spend points earned by participating in official organised play and tournaments to obtain exclusive cards