Capital Raising for Venture/Growth companies (scale-ups/start-ups)

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How do roles differ for Analysts / Associates who work on capital raising advisory for venture / growth stage companies (i.e. Series B / C / D fundraise from VCs or growth equity firms for scale-up or start-up companies) vs typical M&A roles.

What does the role entail? What is the level of modelling etc? Best firms with Analyst level roles in London.

Thank you!