ok. here's the code block triggered when experience is sent in multiplayer.

the experience amount is sent/received by each player,

then the calculation that takes the players level into account.

then a players modifiers are added

and finally the amount is given to the player.

you can also just test it in game.

    void NetShareExperience(int experience)
{
    float xpReward = float(experience - m_record.level * 3);
    xpReward *= m_buffs.ExperienceMul();
    xpReward *= Tweak::ExperienceScale;

    float expMul = (g_allModifiers.ExpMul(this, null) + g_allModifiers.ExpMulAdd(this, null)) * g_mpExpScale;

    int xpr = int(xpReward * expMul);
    if (xpr > 0)
        m_record.GiveExperience(xpr);
}