I've just done some quick calculations. To provide the DB pension assuming NRA 65 on a salary of €50k, the contribution required for a 48 year old would be about 20% - 25% of salary. So depending on what you are currently paying into your DB scheme, the rest of the cost is falling to the employer. So if you are not paying any conts - the overall total of your benefits would be approx €62.5k.
I'm excluding the death benefit - as you prob will get something similiar with new employer.
With your new employer you will be getting 25% more, and they will be paying 10% into the scheme, so overall benefits would be approx €68.75k so on broad figures terms you would be better off moving to new scheme.
However - I don't think pension should be a major decider in moving jobs at all. I would make a list of pros and cons, excluding the pension altogether.
DB and DC schemes work on totally different principles - and I'm not sure I buy into the "rolls royce" theory that DB is better than DC. It is all about risk, with DB the employer takes on the risk ( and rewards if they pay out) - and with DC the employee takes on the risk ( and rewards)
There is also no guarantee that your DB scheme will exist next year - or in 10 years time. Employers unfortunately are pulling the plug on DB schemes regularly. Also if the scheme is badly funded, there is no guarantee that you would get your promised benefit of n/60ths at retirement. DB schemes are not a guarantee - only a promise.
DC schemes rely on the contributions paid in and the performance of the investments - so if they do well you will benefit, not the employer. And unfortunately vice versa.