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1380 RP is correct.
When League of Legends was released in October 2009, 10 euro was worth $1.49 and today 10 euro is worth $1.13, a decline of 32%.
In October 2009 EU players received 1780 RP for 10 euro and after this change will receive 1380 RP, a decline of 29%.
That 1380 RP is the same as US players receive for $10 and is just enough to cover a 1350 RP skin. The reason those amounts are the same even though a euro is worth $1.13 is because EU countries charge Riot VAT averaging 20% meaning we still receive slightly less $ when a EU player purchases RP compared to an NA player.