Hi TLS Guy,
finally, I discovered what kind of caps has the original in Celestion SL6: two 4.7uf 50v Alcap and two 8uf 50v Alcap.... So, mine original is only the 4,7 -50Vn Alcap, and were changed the Alcap 8uF-50Vn with this Fastcon 10uF - 100 V.
Conclusion is: YOU're right, the diference no...