Amundi Floating Rate USD Corporate vs Vanguard Global Bond Index Fund EUR-H Acc

They track different indices: Amundi Floating Rate USD Corporate follows Markit iBoxx USD Liquid FRN IG Corporates and Vanguard Global Bond Index Fund EUR-H Acc follows Bloomberg Global Aggregate Float Adjusted. They also differ in cost (0.18% vs 0.15% TER), replication (physical vs physical) and domicile (Francia vs Irlanda).

Nobody can know that: they track different indices, so their returns will diverge, and past index performance is not a prediction. What you can control today is the cost, the tax structure and whether the index actually covers what you want exposure to.

Vanguard Global Bond Index Fund EUR-H Acc has the lower annual fee. Applying the same 7% gross return to both with €300/month, that fee gap alone is worth about €563 after 20 years — that part is arithmetic, not a forecast.

Both are accumulating, so on this point there is no difference between them.

Yes. Unlike two funds tracking the identical index, these give you genuinely different exposure, so holding both is not automatically redundant — just be aware you may end up overlapping on the largest companies and doubling your rebalancing work.