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Experience is supposed to take you the upper skill level, making you more valuable than any guy out of school or a junior.
Learning the basis of a language is fast, acquire experience is long. This new guy will make errors that the older guy would not do thanks to his experience... The time the junior fixes all the bugs your senior developer will be able to teach him tricks on this new tech.
The technologies doesn't change a bad developer in good one. The real question to accept the salary raise should have been "Is the guy as competent as my senior".
The guy should have been raised compared to another Junior hired, not 30% over a senior... You must be hell of hurry