“The credit risk of a GSS bond is identical to that of a conventional bond from the same issuer, and so tends to carry the same credit ratings, according to Sascha Stallberg, who runs a green bond fund at Nordea.”

[COMMENTARY] Though this is one issuer commenting, it’s probably true generally. It augurs well for green bond issuance.
Green and social bonds ‘not more risky’ than conventional bonds, by Chloe Cheung, August 8, 2023, FT Advisor, UK.